Pneumatic tire



Aug. 30, 1927.

, F. LE R. MAIN PNEUMATIC TIRE Filed Feb. 1o. 192s ilill/lll Illlllllhl0IIllllllllllllllllllllb 61H01 wat;

Patented Aug.. 30, 1927.

UNITED STATES 1,640,844 PATENT OFFICE.

FRANK LE ROI MAIN, OF BIRMINGHAM, MICHIGAN, ASSIGNOR CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION TO GENERAL MOTORS OF DELAWARE.

:PNEUMATIC TIRE.

ApplicationY led February 10, 1926. Serial No. 87,358.

The invention relates to improvements in pneumatic tires, as described in the present specification and illustrated in the accompanying drawings that form part of the same.

The invention consists essentially of the novel arrangement and construction of parts whereby the tire Wall lower edge thereof is further pro-vided with an integrally formed compressible 'filler pad.

The objects of the invention are. to devise a pneumatic vtire which may be manufactured with desirable tolerances and readily applied to rim structures in such manner that the tire bead and rim tire seat will meet and remain vin contact, thereby preventing chafing of the tire bead or pinching of the inner tube.

In the drawings, Figure 1 tional view, showing the side walls of fitted to a straight side rim.

Figure 2 is a cross sectional view showing a modified form of the tire fitted to a clincher type rim.

Figure3 is a cross sectional view showing a modified form of the tire fitted to a rim having a removable side'ring; whilel Figure 4 is a cross sectional view showing a modified form of the tire fitted on a straight side type of rim with the case or 'valley portion of reduced diameter. v

Like numerals of reference indicate corf responding parts in the several figures.

Referring particularly to Figure 1 of the drawings, the numeral indicates a tire is a cross seca tire having the side walls 11 each having the bead 12 formed around the inextensible cable 13 as customary, these beads being made to a diameter that will lit onto a metal rim 14, shown in this instance with straight side walls 15, and it will be understood that the tire beads and rim being both inextensible will require that certain manufacturing tolerances must be allowed. and when ithappens that a rim of a minimum tolerance in size is used with a' tire of a maximum tolerance in size, a sufficient space is left between the two to permit relativel movement of the said rim and tire, and this movement often causes chafing and permits moisture to enter under the tire beads, which rots the fabric of the tire and likewise any protective strip such as shown at 16. It is also not unusual for the inner tube 17 to become inched between the rim and vtire bead and e cut through.

having a bead at the In the present invention a pad 18 of soft pliable rubber is vulcanized to the under side of the bead, and extends from the inner side or toe portion 19 to a point adjacent the outer side or heel portion 20, sufficient space being left between the heel 20 and the side wall of the rim for the soft rubber pad to fiow into the same, as al o to Iflow inwardly past the toe when the tire and rim are suiiciently close in size'l In Figure 2 the tire 21 has the beads 22 formed in the well known clincher shape,

and has the soft rubber pad 42 to fit the clincher rim 23. Likewise in Figure 3 a tire 24 is shown with the pads 25 fitting the rim 26 with the quick detachable ring 27 `while in Figure 4 the tire 28 has the pads 29 forming more decided toe portions with the center space 30 formed to permit flow of the pad when required to it the drop centre portion of the rim` 31.

The tires as shown will always be easy to remove from the rims as the soft pad fits tightly against the rim metal and seals it against wear or corrosion, and yet when the pressure inside the tire is released the side walls and beads may be easily separated from the rim, as the soft rubber of the Apad will always permit the bead to be moved inwardly from the side wall of the rim when tlere is no inside air pressure to hold it in ace.

. It will b e obvious that the pads shown in Figures 1 to 3 inclusive may beV ribbed as shown -in- Figure 4, and other modifications may be'made without departing from the spirit of the invention.

I claim:

1. A pneumatic tire casing formed of cmparatively inextensible rubberized material and having side walls with bea-ds around their inner periphery and compressible pads of rubber fastened to saidbeads on the inner periphery thereof and extending therearound and ridged to permit flow of the rubber when contacting with the base of' a tire receiving rim.

2. A cushion tire formed of comparatively virfextensible material having side walls with a compressible ridge narrower'than and extending around the inner periphery of said side walls for engagement with a tire re-v ceiving rim.

In testimony whereof I affix my signature.

FRANK L. MAIN. 

